Ghost Rider by Potatochan (Canada)

Now that Luigi has successfully restored the Dark Moon, the ghosts of the Mushroom Kingdom have become friendly. Mario can ride on them as he navigates this tricky mansion, filled with undead Dry Bones and vicious Mario-eating Piranha Plants.

Potatochan - is a 14 year old level creator from Canada, who bought Mario Maker on release but only made a few bad levels before getting bored. Around the beginning of 2018 he was inspired by CarlSagan42’s youtube videos to come back to the game, and he ended up becoming a fairly well-known troll level creator.